Answer:
The correct answer is D.They have stars that may appear to wobble.
Step-by-step explanation:
Binary star - Wikipediaen.wikipedia.org › wiki › Binary_star
''Astronomers have discovered some stars that seemingly orbit around an empty space. Astrometric binaries are relatively nearby stars which can be seen to wobble around a point in space, with no visible companion. The same mathematics used for ordinary binaries can be applied to infer the mass of the missing companion''
-Wikipediaen.wikipedia.org › wiki › Binary_star
-Edge 2021
Iv'e done this one before.
Some commonly look like this: